Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8267f8b5f346212…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 23:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a447a26cb5080cacd5ac8a2613304ec SHA-1: cb9eb71057ab5f291ac81b04ceaa154db1f49ba3 SHA-256: d8267f8b5f346212f8c7c9cf4b8029aae808cecf003379df6f782c102ffddf60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.farmaciabergua.com/userfiles/files/53938447443.pdf In PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/lajamisev.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1781c0e801fd8f1f5b9905991838a1de/fosamowamakofitadafe.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160790277aad38---64710403414.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/3196397088.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/bodijisupaloba.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/fukakafaxibusibedopazera.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f10a9c5716e---24474437670.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/71955941716.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/90309306951.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0b06fffb1ca0873be5e3c6ad83bc24b4/jutunonogimonodew.pdfIn PDF document text
    • http://djpress.pl/Image/files/67635751764.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/h98qpf5k9g8n3l32m9rht808u4/vulubudinegem.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/fafem.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/57989516646.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/82000976035.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/552158f7e97e6ffc0c418c1355db1cdf/zupatapanodajosarigizos.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/3127536287.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8a1c48e90ff326d8d61c910153484edc/15282199989.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3d0j1ca9jgkkrb09nb9rfo0bf1/meremokonatibidalifazoz.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/zubugukeves.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/rugux.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kagufisabar.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/33735158875.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca719cdde---29920508172.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e188d1f2cf98ff75fbae67c2938e0f96/81478296858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=introduction+to+continuum+mechanics+reddy+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 16768 bytes
SHA-256: 9a334d6e79aa9d7a026c49d99a9f021f3e23c47525e2d3f6cc10092d487e332e
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 11004 bytes
SHA-256: a7a21c0e43ddecac4f54b4bb20a121fcd81569e116e445038a04bfa54562df33